Masterbation help!

When I masterbate I only play with my clit, nothing has ever been inserted inside my vagina not even a tampon. I am frightened that it will hurt so I just stick to my clit. When I touch myself I tie a sock in a naught and hump it while watching porn. Does anyone else do this???!! Or am I the only one !😂 but I wanted to know when you climax when you're touching your clit how can you make it last longer it only lasts for 5 seconds!! And then I have to wait ten more min. To touch it again bc it's sensitive. SOMEONE PLEASE HELP OR TELL ME YOU FEEL THE SAME WAY!!! COMMENT !!!